Tire-inflating pump



H. K. AUSTIN.

TIRE INFLATING PUMP.

APPLICATION FILED APR. 1|, 1919.

Patented Apr. 6, 1920.y

T TYs.

HENRYK. AUs'riN, or READING, MessaCIA-Iusnrrs.r

frmn-rivrnnmine PUMP.

Y Specification of Letters Patent.

Patented Apr. e, 192e.

Application filed April 11, 1919. Serial No. 289,296.

To all whom t may concern.'

Be it known that I, HENRY K. AUSTIN, a citizen of the United States, residing at Reading, in the county of Middlesex and State of Massachusetts, haveinvented new and useful Improvements in Tire-Inflating Pumps, of which the following is a specification. Y i l This invention relates to a tire-iniiating pump of the type shown lby my Patent No. 1,045,495, .dated November 26, 1912, said patent disclosing a tire-inflating pump comprising a horizontally elongated base having aA pump cylinder connected to one end portion, the other end portion having a horizontal vpassage communicating `with the pump cylinder, and yhaving also two vertical air chambers communieating with the horizontal passage, Vsaid chambers and passage being in the same vertical plane, said air chambers being provided with valve seats, valves in said chambers to co erate with said seats, and a piston in said cy inder.

he invention is embodied in certain improvements in the pump base, whereby the said valves are adapted to 'be closed or seated by gravity aided by atmospheric. pressure, without the vaid of a spring` or springs, and inthe pump piston whereby its effectiveness is increased.

. Of the accompanying drawings forming a part of this specication,-`

Figure 1 is a side view.

Fig. 2 is a fragmentary 'view' lookingto-V ward the side of the pump shown at the left of Fig. 1.

Fig. 3 is a section on line 3-3 of Fig. V2,

showing the piston rising in the cylinder.

ig. 4 is a view similar to Fig. 3,. showing the piston descending in the cylinder.

F1g. 5 is a view similar toa portion of Fig. 4, showing the piston at the limit of its down stroke.

The same reference characters indicate the same parts in all of the figures.

In the drawings, 12 represents a pump cylinder, and 13 a piston of any suitable construction, movable in the cylinder, the piston being'provided with a rod 14 having a handle 15. elongated base attached to the lower. end of the cylinder, and having a bottom face adapted to bear on a supporting surface. In the cylinder is a main air Vconduit 17, communicating at one end with the cylinder and extending therefrom substantially parallel as shown by Fig. 3.

16 represents a horizontally with the bottom face of the'base, one end 17 a oli' the conduit being offset upwardly, as shown by Figs. 3 and 4, and thus located above the valve v seat of the inlet valve chamber, next inlet valve chamber near one end ofthe base, said chamber being vertically elongated and perclpendicular to the bottom face of the base, an of the mainl conduit. The valve chamber 18 is provided at itslower end with an upwardlyy facing valve seat 19, which is below the offset end 17a.

20 represents an air inlet conduit of kangular form, communicating at one end with the lower end of the valve chamber 18, and at its opposite or 'inta-ke end with the atmosphere, said intake end being in the upper portion of the base 16, andspaced from the bottom face of the not liable to be obstructed by dirt. The upper end or head of the valve chamberk 18 is formed by an imperforate lplug .21,`

screwed into a tapped orifice in the base, said plug constituting a `valve stop, located above the end 17a of the main conduit, and arranged to permit the inlet valve 26, hereinafter described, to rise above the end 17,

22 represents an outlet lvalve chamber, communicating at its main conduit 17 between, the inlet -valve chamber 18 and the cylinder. 12. Thevalve chamber 22 isperpendicular to the bottom communicating with the oset'end 17EL latter, so that it is i described. 18 represents an f lower end Vwith the Y face of the base, and is rovided at its lower end with an upwardly acing valve seat 23.

24 represents a nipple screwed into a tapped orifice in the base and forming a valve stop at the upper end of the outlet valve chamber 22, said nipple being provided with a flexible conduit 25 adapted at its outer end to be. coupled to a tire valve.

26 represents an inlet Vvalve which is weighted and adapted to be closed by gravity on the seat 19 of the inlet valve chamber, and provided with a guiding lstem 27,which is movable in and guided bya portion of the air inletconduit 20. 1

28 represents an outlet valve adapted lto be closed by gravity on the seat 23 of the outlet valve chamber, and providedwith a guiding stem .29, which is movable in and guided by the branch conduit 30 which connects the valve chamber 22 with the main conduit 17.

. through the inlet.conduit 20, and raises the surface at opposite inlet valve 26 to the stop provided by the plug V21, so that air is permitted to pass freely to the main conduit 17, as shown by Fig. 3, the outlet valve 28 being at the same time held upon its seat by gravity, aided by suction in the main conduit 17, so that the cylinder 12- is filled with air below the piston. lllhen the piston is descending, the weighted inlet valve 26 is seated and held upon its seat by gravity, the outlet valve 28 being at the same time raised to contact with the stop formed by the inner end of the nipple 2&1. The nipple is provided with radial grooves 3l in its inner end face, said grooves permitting air to pass from the valve chamber 22 to the nipple, when the valve 23 is raised, as shown byFig. 4.

The chief novelty in the structure lthus far. described resides in gated inlet valve chamber 18, having the upwardly facing valve seat 19 at its lower end and the imperforate }V)lug or valve stop 21 at its upper end, the air inlet conduit 2O communicating with the chamber 18 below the valve seat, the weighted valve 26, closed byfrgravity on the seat 19, the main air conduit 17, 17a, communicating with the chamber above the valve seatpthe imperforate plug 21 being arranged to permit the valve to rise above the intake end of the main air conduit, and thus permit air to pass freely to the cylinder.

The base 16 is provided at opposite sides with ears 32, projecting laterally from the base and cylinder. To said ears are con'v nected by pivot-pins 33, two foot rests 34:, which are adapted to bear on a supporting engaged by both feet of the person operating the pump, said rests being foldable against opposite sides of the cylinder', as indicated by dotted lines in Fig. 2.

rlie pump piston includes two flanged or cupped flexible members or cup-washers 13a of leather, or other suitable material, arranged at opposite sides of a metal washer 36, the annular flanges 13l of the cup-washers projecting in opposite directions, and the central portions of the cup-washers being clamped between the central washer 36 and nuts-37-engaged with a threaded portion of the Vpiston rod 14. The annular flanges 13a are liable to shrink or contract, so that they do not contact effectively with the interior of the cylinder, the result being a leakage of air between the piston and cylinderwhen the pump is in operation. To enable the operator to expand or set out the flanges 13a whenever this is needed to'overcome leakage, I provide the piston with two flange-expanding rings 39, each of which is a metal ring,` preferably of sheet meta-l, contracted at its inner edge to form an inwardly projectingr lip 39a. Said lips loosely eniinovable into and the vertically elon-V sides of the base and be" brace the nuts 37, and are adapted to slip thereon, so that the expanding rings 39 are out of the flanges 13a of the cup-washers. Stops 40 fixed to the piston rod, .limit the outward movements of the said rings. The external form Yof the expanding rings 39 is such that whenV they are forced into the space surrounded by the lianges 13a, they expand or set out said flanges, sufficiently to prevent leakage of air. The lips 39aL of said rings are normally in contact with the stops 4:0, so that the rings do not exert expanding pressure on the washerv flanges 13a, unless they are forced into said flanges.

1n case the operator leakage of air between the piston and cylinder, he increases the down stroke of the piston to cause the lower expanding ring 39 to contact with the pump base and force finds that there is a f said ring into the flange of the lower cupf washer, as Shown by Fig. 5, Yand increases the upward stroke of the piston to cause the upper expanding ring 39 to contact with the head 43 of the cylinder and forcesaidring into the flangev of the upper cup-washer.

The expanding rings 39 do not remain inl positive expanding contact with the flanges 13, but work outwardly during the ordinary operation of the pump, until the operator again forces them into positive expanding contact by increasing the lengthV of the stroke of the piston. 1t is obvious that in case the piston has only one cup-washer, only one expanding ring 39 will be required.

l claim:

1. A tire-inllating pump comprising a cylinder, a piston therein, a horizontallyelongated base attached to the lower end of the cylinder and projecting from'one side of the latter, saidbase having a longitudinal main air conduit communicating at one end with Ythe cylinder, a verticallyrelongated inlet valve chamber in' the outer end portion of said base, having an upwardly facing valve seat at its lower end,'and communicating above said valve seat with the opposite endY of the main air conduit, an air inlet conduit in the base communicating at one end with the atmosphere, and at the other end with the inlet valve chamber, below the valve seat in the latter, an inlet valve movable vertically inthe inlet valve chamber, and weighted to normally close by gravity on the seat lof said chamber, the inlet valve being raised by suction in the main air conduit when the piston is rising, and an imperforate plug closing the upper end of the inlet valve chamber, and forming a stop arranged to permit the inlet valve to rise abovethe main air conduit, so that free passage of air from the inlet air conduit to the main air conduit is permitted when the inlet valve is raised, the said base being provided with an outlet valve chamber communicating with the main air conduit between the inlet valve Chamber and the cylinder, and With an out let valve in said outlet valve chamber, opened by pressure in the niain conduit when the piston is descending, and closed both by gravity and by suction in the main conduit when the piston is rising.

2. A tire-inating pump comprising a base,' a cylinder opening at its lower end into the base and having a head at its upper end, a piston movable in the cylinder and including a pair of fieXible cup-Washers having annular flanges, a piston-rod to which said Washers are attached, and a pair of langefexpanding rings loosely connected with the piston and adapted to be forced by extended movements of the piston into contact, one with the base, and the other with the cylinder head, to expand Said flanges, the piston being provided With stops limit-V ing the movements of said rings.

In testimony ywhereof I have affixed my signature.

HENRY K. AUSTIN. 

